Franklin Electric SUBDRIVE UTILITY UT3P Manuel Du Propriétaire page 33

Condition Display
Pressure Fluctua-
tions (Poor Regu-
lation
Run On
Won't stop pump
Runs But Trips
1-7
Low Pressure
High Pressure
Audible Noise
RFI-EMI
Interference
Intermittent drive
or pump operation
x 5
Possible Cause
• Pressure sensor placement
and setting
• Pressure gauge placement
• Pressure tank size and pre-
charge
• Leak in system
• Air in pump intake (lack of
submergence)
• System response setting
• Pressure sensor placement
and setting
• Tank pre-charge pressure
• Impeller damage
• Leaky system
• Sized improperly (pump can't
build enough head)
• Check fault code and see
corrective action
• Pressure sensor setting,
pump sizing
• High temperature
• Pressure sensor setting,
pump rotation, pump sizing
• Shorted sensor wire
• Fan
• Drive
• Hydraulic
• Plumbing
• Poor grounding
• Wire routing
• Radio or other electronic
equipment too close to motor
leads
• Open Circuit
• Drive motor output is wired
through the pump pressure
switch
Corrective Action
• Correct pressure sensor placement and settings
• Tank may be too small for system flow
• This is not a drive problem
• Disconnect power and check pressure gauge for drop
• Set deeper in the well or tank; install a flow sleeve with airtight
seal around drop pipe and cable
• If fluctuation is only on branches before sensor, enable Steady Flow
• Adjust System Response value
• Check frequency at low flows, pressure setting may be too close to
pump max head
• Verify precharge at 70% if tank size is larger than minimum,
increase precharge (up to 85%)
• Verify that the system will build and hold pressure
• Enable bump and/or aggressive bump
• Increase minimum frequency
• Proceed to fault code description and remedy
• Adjust pressure sensor, check pump rotation
• Check frequency at max flow, check max pressure
• High ambient and/or drive temperature will cause drive to
foldback power and run with reduced performance
• Adjust pressure sensor
• Remove sensor wire at Input Board, if drive stops running, wire
may be shorted
• Remove sensor wire at Input Board, if drive continues to run,
replace drive
• Verify condition of sensor wire and repair or replace if necessary
• For excessive fan noise, replace fan
• If fan noise is normal, drive will need to be relocated to a more
remote area
• If hydraulic, try raising or lowering depth of pump
• Pressure tank location should be at entrance of water line into house
• Adhere to grounding and wire routing recommendations
• An additional external filter may be needed.
• Wire the drive directly to the pump/motor, bypassing the pump
pressure switch.
MAINTENANCE
Troubleshooting
33